Downdraft-furnace.



A. R. ATTEBERHY. DOWNDRAFT FURNACE. APPLICAUQN man MAH. 30. 19m.

Paented Jan. 9, H91?.

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A. R. ATTEBEHRY. DOWNDRAFT FURNACE. APPLxcATioN FILED MAR. so, 191s.

L21 1965?., Patented Jan. 9,1917.

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ALVIN R. ATTEIBERRY, OF SPRINGFIELD, ILLINOIS.

DOWN DRAFT-FURNACE.

Application filed MarchBO, 1916.

To all @07mm t may concern:

Be it known that I, ALvIN R. ATTEBERRY, a citizen of the United States, residing at Springfield, in the county of Sangamon and State of Illinois, have invented a new and useful Downdraft-Furnace, of which the following is a specication.

The invention relates to hot air furnaces adapted to burn coal or similar fuel.

The purpose of the .invention is: to provide a down-draft furnace of simple construction and of relatively low first cost, which may be advantageously operated with the cheaper grades of fuel, and which shall have a relatively large radiating surface.

The invention is illustrated in the annexed drawings, to which reference is hereby made and will be hereinafter particularly described, and the novel features thereof will be recited in the claims.

Figure l isa top plan of the furnace; Fig. 2 is a vertical longitudinal section on the line 2. 2. of Fig. l; Fig. 3 is a front elevation of the furnace. Fig. 4 is a vertical transverse section on the line 4. 4. of Fig. 1. Fig. 5 is a horizontal longitudinal section hrough the furnace on the line 5. 5. of

Similar reference numerals designate the same parts in the different views.

The oblong body or shell 6 is preferably of boiler-plate iron, but other suitable material may be used. The casing 7 is preferably of galvanized sheet iron and incloses the shell so as to leave air space all around the shell. The shell is supported on legs 42, so that air may circulate freely under the shell. By reason of the construction shown and described the entire periphery of the shell, the entire periphery of the smoke pipe and the bottom of the shell are all heat radiating surfaces, which give maximum efiiciency to the furnace. Deck castings 8, having inclined tops and vertical front plates integral with the tops, extend transversely across the interior of the shelland rest on brackets 9 secured on the walls of the shell. The deck-castings 8 are in two sections, parting along the longitudinal central line of the shell. The sections are adapted to be inserted through the fuel-door opening and when they are in place on the brackets 9, they fill the transverse space of the rear part of the shell. A battle plate 10 is transverse to the shell above the deck 8, leaving a space between the lower edge of the baille plate Specification of Letters Patent.

Patented Jan. 9, 1917.

semi No. 87,831.

and the inclined top of the deck, through which smoke and gas may pass into the smoke pipe. Below the deck 8 and adjacent to the `grate, is a transverse baHie plate 12. Below the baffle plate l2 is an opening 18 through which smoke and gas may pass from the ash pit into the smoke box and thence outward through the smoke pipe. In the lower part of the wall of the shell is an opening 14 adapted to accommodate the smoke pipe 15. In the upper part of the' rear wall of the shell and above the deck 8, is an opening 16 vaccommodating a short pipe 17, which intercommunicates between the combustion chamber and the smoke pipe. A damper 18 is adapted to oscillate in the pipe 17 and is operated by a handle 19 on the outside of the casing.

An E -shape air in-take pipe 2O extends through the casing, through the shell and downward into the combustion chamber above the grate. A door 21 at the outer terminal of the pipe is hinged on the pipe and is adapted to be raised by a chain 22, extending upward into the compartment which is being heated. On the door 2l is a damper 23 adapted to control the air supply through the door. A pipe 24 communicates with the interior of the pipe 20 and extends upwardly into the apartment being heated and takes air from the room through a register of any approved construction (not shown) and delivers it into the pipe 20. This construction admits of very accurate control of the air supply and admits of taking the air either from the apartment or from the outside. The casing 7 has openings 25 accommodating the .pipes 26, which convey hot air to the apartments. A water pan 27 on top of the shell, is supplied with water through a tube 28.

Door frames 29, 30 and 31 extend across the space between the shell and the casing. The fuel door 32, the shaker door 83 and the ash pit door 34 are hinged on the frames 29, 30 and 31 respectively. The door opening 48 covered by the door 32 is of greater width than the width of one deck section, in order that the deck sections may be easily introduced, or removed, through the door opening.

The fire-box consists of two cast iron sections, parting along the central longitudinal line of the shell and adapted to be inserted through the fuel door opening. In

the back of the fire-box 35 are narrow vertical slits 36 in registry with corresponding slits 37 in the front wall of the box 8. In case of excessive gas pressure in the fire-box, the gas will force its way through the vents 36 and 37 and avert explosions which might result, if means for `escape of gas were not provided.

The grate 38 is a segmental casting having a series of holes 39 through which ashes fall into the ash pit when the grate is shaken. An ash pan 43 will receive the ashes fallingthrough the gra. The grate is adapted to oscillate on a stud 40 on the baille plate 12. Inwardly projecting fingers 41 on the back plate of the ire box extend across the ri-shaped openings on each side of the stud 40. rIhe grate oscillates under the fingers and the fingers keep the fuel from falling through the openings while the grate is being shaken.

On the door 34 is a damper 44 controlling the admission of air into the ash pit. In the front of the grate is a mortise 45, to receive a poker or other instrument for operating the grate.

Operation: Before starting the fire, the register in the room which admits air to the pipe 24 will be closed. rIo start the fire, kindling will belaid on the grate and clean, small fuel will be laid on the kindling; the damper 18 will be opened, the kindling will be ignited, the doors 21, 29 and 31 will be closed and the damper 44 will be opened. The direct draft will then be through the damper 44 upward through the ash pit, upward through the grate and through the fuel into the combustion chamber, thence through the short pipe 17 into the smoke pipe 15, and thence to the chimney, as indicated by the arrows 46. TWhen the fire is well started, the dampers 18 and 44 will be closed and the door 21 will be opened, the draft will then be through the intake pipe 20 into the combustion chamber, thence downward through the fuel and through the grate into the ash pit, thence through the opening 13 into the smoke pipe 15, and thence to the chimney, as indicated by the arrows 47. If combustion is too rapid, the door 21 will be partially or wholly closed and the damper 23 will be adjusted to control the admission of air, and thereby regulate the combustion as may be desired. If after a time the combustion becomes too slow, a pull on the chain 22 will raise the door 21 to admit more air to accelerate the combustion, or the same re- Copies of this patent may be obtained for sult may be accomplished by opening the register in the room which is being heated, to take air from the room through the ypipes 24 and 2O into the combustionchamber.

I do not-restrict my claims to the precise construction disclosed, because it is obvious that minor details of construction may be varied without departure from my invention.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a furnace, the combination of an oblong shell; a stationary baflie plate centrally transverse to the shell and having a forwardly extended member; removable deck sections complemental to each other and together occupying the full width of the rear part of the shell, each deck section comprising a forwardly inclined top plate and a perforated front plate; removable fire box sections complemental to each other and supported on the forwardly extended member of the baffle plate and between the wall of the shell andthe front platesof the associated deck sections and together occupying the full width of the front part of the shell and having openings in registry with the perforations in the front plates of the associated deck sections; and a grate mounted on the forwardly extended member of the baille late.

p 2. In a furnace, the combination of an oblong shell; a stationary baiiie plate centrally transverse to the shell and having a forwardly extended member; removable decksections complemental to each other and together occupying the full width of the rear part of the shell, each deck section comprising a front plate and a forwardly inclined top plate; removable fire box sections complemental to each other and supported on the forwardly extended member of the bailie plate and between the wall of the shell and the front plates of the associated deck sections and together occupying the. full width of the front part of the shell; and a grate mounted on the forwardly extended member of the baffle plate. y

In witness whereof I have hereunto signed my name at Springfield, Illinois, this 15th day of March, 1916.

ALVIN R.

Witnesses:

N. DU Bois, MYRA TnoMrsoN.

A'ITEBERRY.

five cents each, by addressing the Commissioner of Patents;i Washington, D. C. 

